Computer casing



FIG. 1 is a perspective view showing a computer casing of my new design when not in use;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a perspective view showing my new design when in use. 

The ornamental design for a computer casing, as shown and described. 